Neutralization reaction between an acid and a metal hydroxide produces water and a salt. This is because the acid and metal hydroxide react to form a salt and water through the transfer of hydrogen ions.
In a neutralization reaction, the acid donates a hydrogen ion (H+) to the hydroxide ion (OH-) from the metal hydroxide. This forms water (H2O) and a salt (an ionic compound made up of a positive ion from the metal and a negative ion from the acid). For example, the neutralization of hydrochloric acid (HCl) with sodium hydroxide (NaOH) produces water and sodium chloride (NaCl), which is a salt.
Examples of other acid-base reactions are neutralization of a strong acid with a weak base or the neutralization of a weak acid with a strong base. Additionally, the practical applications of neutralization reactions are in industries such as agriculture and medicine.
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what is the volume, measured in liters at STP, of 285 grams of the gas acetylene, C2H2?
285 grams of acetylene at standard temperature and pressure (STP) have a volume of 24.45 liters.
How to find the volume of a gas?To find the volume of a gas at standard temperature and pressure (STP), you can use the ideal gas law: PV = nRT, where P is pressure, V is volume, n is the number of moles, R is the ideal gas constant, and T is temperature.
STP is defined as 0 °C (273.15 K) and 1 atm (101.325 kPa)
First, we need to find the number of moles of acetylene. To do this, we use the molar mass of C2H2 which is 26.04 g/mol
n = m / M
n = 285 g / 26.04 g/mol
n = 10.9 moles
Then we can use the ideal gas law to find the volume in liters:
V = nRT / P
V = (10.9 moles) * (0.08206 Latmmol^-1*K^-1) * (273.15 K) / (101.325 kPa)
V = 24.45 L
Therefore, 285 grams of acetylene at standard temperature and pressure (STP) have a volume of 24.45 liters.
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What is ethanol? how can it improve global climate change?
Ethanol, a type of grain alcohol that may be combined with gasoline and used in vehicles, is beneficial to the environment because it is a renewable fuel that is produced from biomass.
Additionally, ethanol burns cleaner and more thoroughly than either gasoline or diesel. Carbon dioxide is removed from the atmosphere as the grain or biomass used to produce ethanol takes it in as part of its growth process, making ethanol a cleaner alternative to gasoline.
By using grain-based ethanol instead of gasoline, greenhouse gas emissions can be reduced by 44-52%, as reported by the Argonne National Laboratory of the United States Department of Energy. Similarly, a team of experts from Harvard, MIT, and Tufts found that modern corn ethanol reduces greenhouse gas emissions by 46% compared to gasoline.
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suppose your given a Stock solution of 15..110 M nitric acid. what volume of water must you add have ready to add your acid to (in mL) to prepare a solution with a nitric acid molar concentration of 2.895 M and a volume of 602.244 mL?
The volume of water must you add have ready to add your acid to (in mL) to prepare a solution with a nitric acid molar concentration of 2.895 M and a volume of 602.244 mL is 487.02 mL
What is the dilution formula?The dilution formula is used to determine the concentration and volume of reagents in a dilution process of acids, bases, or any other solution.
The dilution formula is:
C₁V₁ = C₂V₂
where;
C₁ is the initial concentration
V₁ is the initial volume
C₂ is the final concentration
V₂ is the final volume
Using the dilution formula:
V₁ = C₂V₂/C₁
V₁ = 602.44 * 2.895 / 15.110
V₁ = 115.42 mL
The volume of water needed = 602.44 - 115.42 mL
The volume of water needed = 487.02 mL
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If you were to prepare exactly 1.00 L of a 5 M NaCl solution, you would not need exactly 1.00 L of water. Explain.
A 1 liter volumetric flask can be filled with distilled water until it reaches the graduation mark, 58.44 g of NaCl and this amount of salt can be used to create a 1M solution of the salt.
How would you make 1 liter of a 1M solution of NaCl?In this case, we must determine the volume of the solution as well as the mass of sodium chloride (NaCl) required to make a 1 molar solution of the salt.
The molarity formula,
Molarity=Moles of Solute Volume of Solution, must be used.
The whole solution, in steps:
The moles of NaCl must first be determined. The solution has a 1 M molarity and a 1 L volume.
As a result, moles of NaCl may be computed as,
1 liter of solution equals 1 mole of NaCl.
1 M x 1 L equals 1 mol of NaCl.
In light of this, there is one mol of NaCl in the solution.
Using the quantity of NaCl's moles, we must now determine the mass of NaCl.
Math processing error: Number of moles
58.44 g/mol is the molar mass of sodium chloride, which has a molecular weight of 1 mol.
Processing Error in Math
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Processing Error in Math
So, to create a 1 M solution, we'll need 58.44 g of NaCl.
We will now talk about making a NaCl solution at a single molar strength.
A 1 liter volumetric flask can be filled with distilled water until it reaches the graduation mark, 58.44 g of NaCl and this amount of salt can be used to create a 1M solution of the salt.
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The isomerization of cyclopropane to propylene is a first-order process with a half-life of 19 minutes at 500oc. The time it takes for the partial pressure of cyclopropane to decrease from 1. 0 atmosphere to 0. 125 atmosphere at 500oc is closest to.
The isomerization of cyclopropane to propylene is a first-order process with a half-life of 19 minutes at 500oc. The time it takes for the partial pressure of cyclopropane to decrease from 1. 0 atmosphere to 0. 125 atmosphere at 500oc is closest to 57 minutes.
First, we must get the rate constant.
k= 0.693/ 19 = 0.0365 min⁻¹
Now we need to figure out how long decay takes.
First order kinetics' expression for the rate law is provided by:
t= (2.303/k) log a/(a-x)
where,
Rate constant = k
t = time it took for decay to occur.
Initial reactant pressure equals 1.0 atm, or a.
After the process of decay, a - x equals 0.125 atm of pressure.
After entering all the values into the equation above, we get
t= (2.303/0.0365) log 1/(1-0.125)
t = 57 min
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How will you calculate the partial pressure of gas using Dalton's Law of partial pressures?
The overall pressure exerted by a mixture of non-reactive gases is equal to the sum of the partial pressures of the individual gases, according to Dalton's Law, also known as Dalton's Law of Partial Pressures.
The partial pressure law of Dalton states that
The sum of the partial pressures of the various gases determines the overall pressure that a mixture of gases exerts.
mathematical formula:
P(total) = P1 + P2 +... P (n)
P1 = One gas's partial pressure
P2 is the second gas's partial pressure.
Pn is the partial pressure of n gases.
so to find the patial pressure can be cal culate as follows
P (n)= P(total) - P1 + P2+....
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29130
UO 1601m9
Hower
2. How many grams are in 0.50 mol of copper (II) sulfate?
Transform something quickly: Using the molecular mass finder and the number of moles of CuSO4, 1 mole of Copper(II) sulphate equals 159.6086 gram.
1 mole in grams, how much?
Theoretically, the Carbon-12 atom has this atomic mass As a result, a mole of carbon is exactly equivalent to a gram of carbon, or its atomic mass or weight (12 grams). It is known as a 1 molecular (1M) solution when a substance is dissolved in 1 liter of liquid (1mol/L), a 0.5 molecular (0.5M) solution when it is dissolved in 2 liters of liquid (0.5mol/L), and so on.
What is 1 mole's molarity?
A solution that contains 1 mole of a substance dissolved in a volume of 1 litre is known as a 1 molar solution. For instance: One mole (or one gram) of table salt (NaCl) has a molecular weight of 58.44, making 58.44g the molecular mass of one gram. The number of molecules per liter, denoted by the unit signature mol/L or mol/dm3 for SI units, is the most often used unit denoting molarity in chemistry. One mol/L of a solution's concentration is referred to as one molar, or 1 M.
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Based on the electron configuration of the
two atoms, predict the ratio of magnesium to
bromine in the compound.
Magnesium 1s²2s²2p^6 3s²
Bromine 1s²2s²2p63s²3p64s²3d¹º4p5
A. 2:1
C. 1:1
B. 3:1
D. 1:2
The ratio of magnesium to bromine in the compound will be 1:2 that is option D obtained by the electronic configuration.
Describe electron configuration.The arrangement of electrons in an atom, molecule, or other physical structure is referred to as its electron configuration; for instance, the electron configuration of the neon atom is 1s2 2s2 2p6.
What are the four different electron configuration types?One orbital can accommodate a maximum of two electrons and comes in four different shapes: s, p, d, and f. Because they contain various sublevels, the p, d, and f orbitals may each hold more electrons. As previously mentioned, the electron configuration of each element depends on where it sits in the periodic table.
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Which of the following cell structures do eukaryotes and prokaryotes have in common? (4 points)
a
Flagellum
b
Nucleus
c
Nucleoid
d
Ribosome
The answer to the question is D: Ribosome
How much time will it take a snail to travel 10 meters across the floor if it’s traveling at 2m/s
5 seconds. 5x2=10.
(Don't know why you asked this here, the math is really simple)
What is absorption in digestion and why is it important?
Absorption in digestion is the absorption of nutrients from the small intestine and it is important so that they can be used as energy by the body.
The digestive system is a process carried out by the digestive organ system to process food so that its nutrients can be absorbed by the body and converted into energy.
Absorption is the process of absorbing simple molecules/nutrients through the epithelial cells and villi that comprise them which are then carried into the bloodstream.
The small intestine is part of the digestive tract that completes the digestive process and absorbs nutrients. After food is completely digested both chemically by enzymes, most of the nutrients will be absorbed in the jejunum into the bloodstream which is then used for body energy. Nutrients are used by the body for growth and development, if the intestines cannot absorb nutrients, the body will not have the energy to grow and develop.
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caused by the intense heat that comes from the surfaces of streets roofs of buildings. Iker convinces his teacher to do an experiment. V of other students, Iker builds a rooftop garden to cover one half of building. For one semester, Iker records the air temperature on the building with the rooftop garden and the half of the building witho garden. He finds that the average temperature near the rooftop ga The average temperature away from the garden is 29°C.Iker is worried about global warming. He believes that much of the problem is caused by the intense heat that comes from the surfaces of streets and the roofs of buildings. Iker convinces his teacher to do an experiment. With the he of other students, Iker builds a rooftop garden to cover one half of his school building. For one semester, Iker records the air temperature on the half of the building with the rooftop garden and the half of the building without the garden. He finds that the average temperature near the rooftop garden is 23° The average temperature away from the garden is 29°C.
Air Temperature is the manipulated variable for the global warming.
Explain about global warming?
Global warming is the long-term warming of the planet due to human activities, such as burning fossil fuels and deforestation, which release greenhouse gases into the atmosphere. These gases trap heat from the sun, raising the Earth’s average temperature. Global warming is causing sea levels to rise, glaciers and Arctic ice to melt, and more extreme weather events, such as heat waves, droughts, floods, and hurricanes. In addition, global warming is affecting ecosystems and biodiversity, as species struggle to adapt to the changing climate. To address global warming, we must reduce our greenhouse gas emissions and transition to renewable energy sources.
The manipulated variable for the global warming experiment is Air Temperature. This is because Iker is measuring the air temperature on the half of the building with the rooftop garden and the half of the building without the garden in order to compare the difference in air temperature between the two locations.
Therefore, option a Air Temperature is the correct answer.
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18. Which element would have this electron configuration? 1s 2s 2p 3s 3p
A. Carbon
B. Silicon
C. Radon
D. Germanium
Draw bond-line structures for all constitutional isomers of C5H12.
The constitutional isomers of C5H12 are pentane, 2-methylbutane, isopentane, 2,2-dimethylpropane, and cyclopentane.
Pentane:
H-C-C-C-C-H
| | |
H-C-C-C-H
2-Methylbutane:
H-C-C-C-C-H
| | |
H-C-C-C-H
|
CH3
Isopentane:
H-C-C-C-C-H
| | |
H-C-C-C-H
|
CH3
2,2-Dimethylpropane:
H-C-C-C-C-H
| | |
H-C-C-C-H
| |
CH3-C-CH3
Cyclopentane:
H
\
C-C-C-C-C
/
H
Isomers:
Isomers are compounds that have the same chemical formula but different atomic arrangements. They may be constitutional isomers, which have different atomic arrangements in their main chain, or stereoisomers.
Isomers can also be classified as positional isomers, which differ in the position of a functional group within a molecule.
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What type of heat transfer heats the air in our homes?
Answer:
Conduction: Heat traveling through a solid material. On hot days, heat is conducted into your home through the roof, walls, and windows.
Explanation:
That's a quick answer from gooogle, i hope this helps you :D
Answer:
Heat transfers through solid materials via conduction. The roof, walls, and windows of your house all carry heat on hot days.
Explanation:
Why does convection occur? (1 point)
O Heat flows through the air as electromagnetic radiation, transferring energy without matter.
Heat increases the kinetic energy of molecules; the molecules have greater energy when they collide,
increasing energy transfer.
O Heat causes fluids to become less dense; so warmer fluids rise above cooler fluids, transferring energy.
O
O
Heat is released during some types of reactions and absorbed during others, transferring energy to the
system or surroundings.
Answer:
see full answer in below
Explanation:
Convection occurs when heat is transferred through a fluid, such as air or water. Heat is transferred by three main mechanisms: conduction, convection, and radiation. Convection occurs when the molecules of a fluid are heated, causing them to move faster and become less dense. This causes the warmer, less dense fluid to rise above the cooler, denser fluid, creating a convection current. This current transfers energy from the warmer fluid to the cooler fluid, allowing heat to be transferred throughout the system.
How many grams (g) are in 4.25 moles of Magnesium Chloride (MgCl2) ?
One mole of magnesium chloride has a mass of 95 g. Then the mass of 4.25 moles of magnesium chloride (MgCl₂) is 403.7 g.
What is magnesium chloride ?Magnesium chloride is an ionic compound with the chemical formula, MgCl₂. It formed through the donation of two valence electrons from the metal magnesium to the chlorine atoms.
The mass of one mole of a compound is called its molar mass. The number of moles of the compound is then the ratio of its given mass to the molar mass.
Atomic mass of Mg = 24 g/mol
atomic mass of Cl = 35.5 g/mol
mass of 2 Cl = 71 g
Then, molar mass of MgCl₂ = 24 + 71 g = 95 g/mol
One mole of MgCl₂ is 95 g. Then, mass of 4.25 moles of MgCl₂ is
4.95 × 95 = 403.7 g
Therefore, the mass of 4.95 moles of MgCl₂ is 403.7 g.
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currents used in electrical facial and scalp
The current for facial and scalp treatments is measured in milliamperes.
A unit that measures the resistance of an electric current. A measurement of how much electric energy is in one second.
Electric current is measured using the milliampere unit. The electrical current that is equal to the passage of one coulomb per second is one milliampere or 1/1,000 of an ampere. The SI base unit for electric current is the ampere, and the milliampere is a multiple of the ampere. "Milli" serves as the metric prefix for the numbers 10-3. Sometimes a milliampere is referred to as a milliamp. The abbreviation for milliamperes is mA; for instance, 1 mA can be used to represent 1 milliampere.
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Choose the correct pairing from the following possibilities.
O CH3CH2CH2NH2, propylamine
O CH3CH2OCHg, weak base
O CH2CH2NH2, ethyl ether
O CH2CH2OCH2CH3, reacts with acid to form an ammonium salt.
The correct pairing from the following possibilities is CH2CH2OCH2CH3, reacts with acid to form an ammonium salt.
The measured pseudo-first-order rate constants (k) and their dependence on salt concentrations Here, we plot the rate constants as a function of cation (ammonium or sodium) concentration rather than the overall ionic strength because we observe that ammonium ion concentration better correlates with changes in the observed rate constants.
Decarboxylation of OAA occurs slowly in pure water, and we remeasured the rate of this process in control experiments. The change in the absorbance spectrum over time can We determined the uncatalyzed rate constant for the decarboxylation to be (5.24 ± 0.95) × 10−5 s−1 as an average and standard deviation of two measurements, which shows good agreement with previous work (5.5 × 10−5 s−1).20.
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How many grams of oxygen are in a sample of carbon dioxide (co2) that has 24 grams of c?.
There are 64g grams of oxygen are in a sample of carbon dioxide (CO₂) that has 24 grams of carbon.
First, carbon and oxygen combine to create CO₂as shown below.
C + O₂ => CO₂
The equation states that one mole of carbon combines with one mole of oxygen to produce one mole of carbon dioxide.
Since C's molar mass is 12 g/mol and O's is 16 g/mol
A mole of (C) weighs 12g.
O₂ is composed of 16(2) = 32g per mole.
As a result, 24g of C would equal 24 32 / 12.
= 768/12
= 64g
Therefore, if there was 24g of carbon, there would be 64g of oxygen.
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caused by the intense heat that comes from the surfaces of streets roofs of buildings. Iker convinces his teacher to do an experiment. V of other students, Iker builds a rooftop garden to cover one half of building. For one semester, Iker records the air temperature on the building with the rooftop garden and the half of the building witho garden. He finds that the average temperature near the rooftop ga The average temperature away from the garden is 29°C.Iker is worried about global warming. He believes that much of the problem is caused by the intense heat that comes from the surfaces of streets and the roofs of buildings. Iker convinces his teacher to do an experiment. With the he of other students, Iker builds a rooftop garden to cover one half of his school building. For one semester, Iker records the air temperature on the half of the building with the rooftop garden and the half of the building without the garden. He finds that the average temperature near the rooftop garden is 23° The average temperature away from the garden is 29°C.
The manipulated variable in the global warming experiment is the air temperature.
The correct option is B.
What are the variables in an experiment?Anything that is changeable is referred to as a variable. In other words, it's anything that can be changed, taken into account, or quantified in an experiment.
There are three types of variables in an experiment:
Independent variable or manipulated variableDependent variableConstant variableIn the given experiment, the manipulated variable was the change in the location.
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Jill mixes two types of concentrations of hci (hydrochloric acid): 0. 375 liters of 25% hydrochloric acid, and 0. 625 liters of 65% hydrochloric acid.
Jill combines two different sorts of HCl (hydrochloric acid) concentrations: 0. 375 liters of 25% and 0. 625 liters of 65%. The mixed solution will have an HCl concentration of 1L of 50% HCl.
In this case, we're interested in learning the concentration of HCl as a proportion of the total amount.
First off, the combined volume is 0.375 + 0.625 = 1 L.
The percentage can be calculated as follows:
37.5% of the required 25% is present.
while 62.5% of the 75% are in presence
When we talk about the percentage present, we're talking about the 1 total liter that is there.
Consequently, the final mixture's concentration will be;
(37.5% of 25) + (62.5% of 65)
= 9.375% + 40.625%
50% is obtained by adding both.
Therefore, the concentration is 1L of 50% HCl.
Your question is incomplete but most probably your full question was
Jill mixes two types of concentrations od hci (hydrochloric acid) 0.375 liters of 25% hydrochloric acid and 0.625 liters of 65% hydrochloric acid. what is the hcl concentration in the mixed solution?
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A. Na,P
B.N.O
C. CaSO
D. CHO
22. Label each of the following as either an ionic compound or covalent/molecular
compound. Remember that metal-nonmetal implies ionic and
nonmetal-nonmetal implies covalent
1. Na₃P = Ionic compound ; 2. N₂O = covalent compound ; 3. CaSO₄ = Ionic compound; 4. Cl₂O₇ = covalent compound.
How do ionic and covalent compounds work?When a metal and a nonmetal react, ionic compounds are typically created (or a polyatomic ion). When two nonmetals interact chemically, covalent molecules are produced. As it is a nonmetal, binary compounds containing hydrogen are covalent compounds as well.
What distinguishes ionic and covalent bonding from one another?An atom can participate in covalent and ionic bonds that are considered as the two main types of bonds. By electron sharing, two or more than two atoms can form covalent bonds. When two or more than two ions come together, their opposing charges bind them together to form ionic bonds.
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2.0 moles of gas occupies 44.8 L
at STP. What volume is required
to hold 6.0 moles of gas?
Answer:
134.4 L
Explanation:
At standard temperature and pressure (S.T.P) one mole of any given gas occupies 22.414 dm^3 or 22.414 L (as 1 dm^3 = 1 L ).
So 2 moles at S.T.P would occupy: 2 x 22.414 L = 44.8 L
Similarly,
6 moles of a gas at S.T.P would occupy: 6 x 22.414 = 134.4 L
Answer: 134.4 L
Explanation:
6 moles of a gas at S.T.P would occupy: 6 x 22.414 = 134.4 L
No underwater luminaires shall be installed in a permanently-installed swimming pool that operates on supply circuits over ? between conductors.
No luminaires shall be installed for operation on supply circuits over 150 volts between conductors. Luminaires mounted in walls shall be installed with the top of the luminaire lens not less than 450 mm (18 in.)
In an electrical installation, what is a luminaire?
A luminaire, also known as a light fixture, is a complete lighting assembly that includes one or more lamps (light bulbs or tubes), a socket and other protective elements, wiring that links the lamp to a power source, and a reflector to help direct and spread the light.
The construction, installation, or inclusion of shades or guards on luminaires is required to prevent the exposure of combustible materials to temperatures above 90°C (194°F). Unswitched lamp holders must be used above materials that are very flammable.
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draw correct structure for benzaldehyde
The chemical formula for benzaldehyde is C6H5CHO.
Benzaldehyde is an arenecarbaldehyde composed of benzene with a single formyl substituent. The simplest aromatic aldehyde and family tree of the benzaldehyde class. It acts as a flavoring agent, fragrance, olfactory receptor agonist, and plant metabolite. The main effect of occupational exposure to benzaldehyde is irritation of the skin, eyes, and mucous membranes of the respiratory tract. Benzaldehyde is primarily used as a food and flavoring additive and can be found in many foods, including baked goods, frozen dairy products, fruit juices, soft candies, jelly puddings, soft drinks, alcoholic beverages, candies, and chewing gum. The chemical structure of benzaldehyde has benzene and aldehyde groups.
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What is the total moles of 4.82 x 1024 atoms of helium gas?
(A) 2.00 moles (B) 4.00 moles (C) 6.00 moles (D) 8.00 moles
8.00 moles is the total moles of [tex]4.82 * 10^2^4[/tex] atoms of helium gas. So, the correct option is (D).
What are Moles?The mole is defined as the amount of matter of a system containing as many elementary elements as atoms in 0.012 kg of carbon 12; Its symbol is "Mol". It consists of the amount of a substance which is [tex]6.022 * 10^2^3[/tex] units like particle, atom, ion, molecule etc. of the given substance where a mole measures the number of atoms, ions or molecules.
[tex]Number of moles= \frac{Number of molecules}{Avogadro's number}[/tex]
For above given information,
[tex]Number of moles=\frac{4.82 * 10^2^4}{6.023* 10^2^3}[/tex]
= 0.8002*10= 8.002 moles
Thus, 8.00 moles is the total moles of [tex]4.82 * 10^2^4[/tex] atoms of helium gas. So, the correct option is (D).
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The total moles of 4.82 x 10²⁴ atoms of helium gas is 8 moles . Hence, option (D) is correct.
What is Avogadro constant?The Avogadro constant is a proportionality factor that compares the number of constituent particles (typically molecules, atoms, or ions) in a sample to the amount of substance in that sample.
1 mole of Helium gas has 6.02 × 10²³.
Hence, 4.82×10²⁴ atoms of Helium gas refers = ( 4.82×10²⁴ ÷ 6.02 × 10²³) moles of helium gas
= 8 moles of helium gas.
The total moles of 4.82 x 10²⁴ atoms of helium gas is 8 moles .
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Calculate the molar concentrations of the ions in each solution
18g of sodium sulfate, Na2SO4(s), dissolved in 210 mL of solution
The molarity of the sodium ion is 0.31 M while the molarity of the sulfate ion is 0.62 M.
What is the molarity?First of all, we would have to establish that the molarity would be the same as the concentration of the substance. We know that we can be able to obtain the concentration from the number of moles and the volume of the solution thus we would need to use the mass the substance that we have to be able to obtain the number of moles of the solution that we have.
Mass of the sodium sulfate = mass/molar mass
18 g/142 g/mol
= 0.13 moles
Now we know that;
Molarity of the substance = 0.13 moles/0.21 L
= 0.62 M
Number of moles of the sodium ions = 0.62 M/2 = 0.31 M
Number of moles of the sulfate ions = 0.62 M
These are the ions in the solution.
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The major chemical structures of hormones include
a. polysaccharides, esters, and steroids.
b. only molecules containing amine groups.
c. steroids, amino acid derivatives, and esters.
d. steroids, polypeptides, and anino acid derivatives.
e. only steroids.
Only steroids are included in the principal chemical structures of hormones. How atoms are organized within molecules is referred to as chemical structure.
What mechanisms govern chemical structures?By showing the spatial arrangement the atoms and chemical bonds within the molecule, chemical structure describes how a compound's molecular geometry is formed. A crucial visual depiction of a molecular formula is thus given to scientists in this way. The chemicals known as enantiomers are chiral and mirror-imaged.
How can chemical structures be distinguished?When determining the structures of chemical compounds, one often strives to determine the pattern and strength of bonding between all of the atoms in the molecule; if possible, one also looks for the three-dimensional spatial coordinates of a atoms in the molecule.
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What is the molality of a solution containing
10.0g Na2SO4 dissolved in 1000.0g of water?
Answer:
Explanation:
Use the definition of molality to guide you to find what is needed to solve for molality.
molality = mol of solute/kg of solvent
Step 1: Find molar mass of Na2SO4
Na: 2 x 23.00 g = 46.00 g
S: 1 x 32.06 g = 32.06 g
O: 4 x 16.00 g = 64.00 g
Molar mass of Na2SO4 = 142.06 g/mol
Step 2: Convert 10.0 g Na2SO4 into moles using molar mass of Na2SO4 from step 1.
10.0 g x (1 mol/142.06 g) = 0.070393 mol
Note that grams cancel and you are left with moles.
Step 3: Convert 1000.0 g of water into kilograms of water. Remember that 1000 g = 1 kg.
1000.0 g x (1 kg/1000g) = 1.0000 kg water
Note that grams cancel and you are left with kilograms.
Step 3: Use the definition of molality to find molality for this solution. The solute is Na2SO4. The solvent is water.
Definition of molality = mol of solute/kg of solvent
molality = 0.070383 mol/1.0000 kg
molality = 0.070393 m
There are 3 significant figures in 10.0 g and 5 significant figures in 1000.0 g. Use the least number of significant figures when multiplying or dividing. In this case 10.0 g has the least number of significant figures. The final answer with the correct number of significant figures is 0.0704 m.